package map;

import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;

public class MapDemo3 {
	public static void main(String[] args) {
		Map<String, Integer> map = new HashMap<>();
		map.put("语文", 99);
		map.put("数学", 98);
		map.put("英语", 88);
		map.put("物理", 80);
		map.put("化学", 99);
		System.out.println(map);
		
		Set<String> keySet = map.keySet();
		for (String key : keySet) {
			System.out.println("key:" + key);
		}
		System.out.println("------------------------------------------");
		Collection<Integer> values = map.values();
		for (Integer value : values){
			System.out.println("value:"+value);
		}
		System.out.println("------------------------------------------");
		
		Set<Map.Entry<String,Integer>> entrySet = map.entrySet();
		for (Map.Entry<String,Integer> e : entrySet){
			String key = e.getKey();
			Integer value = e.getValue();
			System.out.println("key:"+key+",value:"+value);
		}
		
	}
}
